Carolina Wren 1/26/18

This little brown job (aka “lbj” in birdspeak) is a relative newcomer to New England winters, having only been a fairly common resident in southern Maine for about 30 years. Field guides will tell you the primary reason for its northward expansion is global warming, and while no doubt that’s a factor, I believe their march northwards is better attributed to the popularity among birdlovers of putting out seeds and suet and meal worms during the winter months. They don’t migrate but are sensitive to severe winters, and frequently many perish in hard years, but they can produce several large broods in one season so that decimated populations recover quickly and soon there are new birds to expand the range even farther. To help them survive winter months, they often roost close to houses which radiate heat at night, creating a microclimate change of a just few degrees, which can mean life or death to them. Consider keeping some old pots, watering cans, or 5-gallon pails filled with dryer lint, dried straw, grasses, or leaves up against your foundation under a deck or stairs for them to sneak into on those nights when the polar vortex is upon us.

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